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Question
The Zeniths is/are 
A.
the point on the upper portion of the celestial sphere marked by plumb line above the observer
B.
the point on the lower portion of the celestial sphere marked by plumb line below the observer
C.
the two points in which the Earth's axis of rotation meets the Earth's sphere
D.
the great circle of the Earth, the plane of which is at right angles to the axis of rotation.
Answer ( Option A)

the point on the upper portion of the celestial sphere marked by plumb line above the observer

Solution

The point on celestial sphere vertically above the observer's station is called zenith and the point vertically below is called Nadir.

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